1. Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892, United States
2. Department of Nuclear Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 03772, South Korea
3. Department of Pharmacy, University of Pisa, 56126 Pisa, Italy
4. Department of Pharmacy, University of Salerno, 84084 Fisciano, SA, Italy